Drill-chuck.



C'. F. SCH'ULTIS:

DRILL 011110K, APPLICATION FILED ILL?, 1909.

939,102. Patented Nov. 2, 1909.`

F13 I. FES:

Yso

ITED STATES PATENT OFFICE.

CHARLES F. SCHULTIS, 0F LAKEWOOD, OHIO, ASSIGNOR TO THE CLEVELAND COLLET AND MACHINE COMPANY, QF CLEVELAND, OHIOFA CRPORATION 0F 0R10..

DRILL-CHUCK.

Speciiicaton of LettersrPatent.

Patented Nov. 2, 1909.

Application filed January 7, 1999. Serial No. 471,067.

Lakewood, in the county of Cuyahoga andV btate or' Uhio, have invented certain new and useful improvements in Drill-Chucks', and l do declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the lllle.

My invention relates to improvements in drill chucks, and consists of a chuck adapted to be easily set and released by hand for diil'erent sized drills or tools, all as herein shown and described and more particularly pointed out in the claim.

My improved chuck is adapted to have a wide range of adjustment and is manipulated by hand for locking and unlocking the drill or tool in the chuck. It is also constructed not to bind or become too tightly locked during operations of the tool. @therwise, unlocking of the chuck would require means other than bare hands to release the parts. Nevertheless, to be effective itis desirable to retain the Selil locking cdect within controllable limits, and my objectY is to provide a chuck wherein both self locking and hand release may be obtained, as well as to provide a chuck having a large range of adjustment to hold ditlerent sized drills or like rotatable tools.

In the accompanying drawings, Figure 1 is a sectional view longitudinally of the drill chuck showing the collet in side elevation and with the jaws retired or in open position, and Fig. 2 is a substantially similar view but showing the parts in their relatively changed positions as when'the jaws are carried to about the limit of their innermost positions for the smallest sizes of drills and the like. Fig. 3 is a cross section of Fig. 1 on line thereof, and Fig. l is a perspective View of one of the gripping aws. J The drill chuck comprises holder or bodv 2 having the usual tapered shank 3 adapted to be placed within and held by the usual rotative means employed in the various kinds and makes of machines found in general use. Body 2 is externally threaded, and preferably coarsely threaded, although not extremely so, say ten pitch S. standard, and this thread -e is shown as extending the full length of the straight portion of body 2, but obviously it need not extend the '.t'ull length. Body 2 is also provided with a central bore 5 at its bottom wherein reduced extension 8 of collet 9 is supported. The main body of this so-called collet member is of substantially the same diainetei' as bodyY 2, and shoulder 10 at'the base of reduced extension 8 seats a tool steel hardened washer 11 which is pressed tightly over said extension. A series of steel anti-friction balls 12 within a follower ring 12 rest upon washer Y 10 and a seco-nd steel washer 13 lies upon said ballsV and bears against the bottoni endV or body 2 and is pinned thereto by pin 7 to prevent independent rotation, and said parts take the extreme thrust of the drill when at work although it must be understood that.

The means for locking the tool in the Vcollet and also locking the collet against rotation upon holder 2 when the tool-is held therein comprise a rotatable hand sleeve 18 and its tapered sleeve ring 19, combined with slidable jaws 20 mounted in beth the collet 9 and sleeve 18. Thus, sleeve 1S has a central through opening approximately equal in size to the diameter of body 2 and the collet, except where slightly enlarged as at 21 to permit freedom of working between the parts. A threaded portion 22 within the top end of sleeve 18 provides working engagement with thread l on body 2 and wherewith sleeve 18 and its ring 19 is moved e axially over the collet when the sleeve is rotated. Y

A reduced portion 23 midway of. sieeve 1S is screw threaded for-ring 19 and the lower extremity 2% of sleeve 18 from threaded portion 23 downward is cone shaped or tapering to snugly iit within the internal taper of ring 19, the angle of which is approximately eighteen degrees. Extremity 24 is slotted on radial lines as represented by 25, Figs. 2

and 3, and collet 9 is likewise provided with slots 25 on the same radial lines, and the gripping jaws 20 are of the same length as said slots and seated therein their full length for transverse slidable movement therein. The shank of the tool (not shown) is adapted to seat withincentral bore 26 in the bottom end of the collet member and the jaws 20 are adjusted and set in respect thereto by the rotary and axial movement of the sleeve 1 and f ring which' eitherv crowd the jaws inward orV move them outward dependent upon the direction of rotation of' said parts.

Thus, each jaw has an inclined face 27 which bears Vagainst the innerjinclined face of ring 19 to thrust thejaws inward, and also inclinedribs 28 which seat within rabbets or grooves in sleeve 18 to carry the jaws outwardi The jawshave a combined transverse andaxial movement within slots 25 of sleeve 18, but only a transve-rse movement in the collet slots, being otherwise fixed in respectthereto by pins or lugs 29 which ride in the cross grooves 30 in the collet at either side of the radial slots therein, see Fig. 3. These pins-also prevent the aws from dropping out of the collet.

The gripping face or surface 31 of the jaws is of any preferred shape or form, but in order that the tool be held firmly and in true alinement with the axis ofthe holder,

the jaws 20 are proportionately of greater length than width. Now to obtain the maximum adjustment for the holder, especially for thesmall sizes, I find it'necessary to bevel or cut away t-he collet at its lower end 32 so as not to obstruct inward movement of the jaws by their ribs 28, see Fig. 2

Both the by the jaws further rotation by hand is checked. However, when the holder and tool and all the parts are at work, the tendency is to still rotate the parts in the same direction as in setting operations and therefore, the parts become locked still tighter, all of which is of advantage in more securely holding the tool. parts the end thrust of collet 9 in respect to body 2 is taken up by anti-friction balls 12. Therethrough, the thrust upon thread-l is minimizedI and made sensitive to hand control and will not become so self-locked or tightly bound that the hand alone cannot release the drill by reversely rotating the sleeve. Y

Briefly, though the construction of thev chuck tends to tightly lock the tool in the collet and the collet on the holder, still the release of thedrill or tool may be instantly and easily obtained by gripping and rotating the sleeve with the bare hand.

Removal of ring 19 fromv sleeve 18 permits access to the interior of the device to remove or replace'the jaws if desired. In operation, said ring 19 forces the jaws inward when sleeve 18 moves upwardly on body2 and holds them in any adjusted position and against outward movement.

Vhat 'I lclaim is:

A" drill chuck comprising a threaded body having-ay slotted hand sleeve engaged there-` with, a f slotted collet rotatably mounted upon said body, jaws slidably engaged and carried-by`v said sleeve and collet and coni'ned 'their 'full length within the collet to sustain torsional strains thereon, and a taperingf ring? removably mounted upon said sleeve `toengage said jaws.

Inftestimony whereof I vaffix my signature in presence of two witnesses.

CHARLES F. SGHULTIS.A

IVitnesses: j

l Ru. Moser, E; M. FISHER.

In this self locking of the 

